Analysis and improvement of SNR in FBG sensing system

Kong, Delong; Chang, Jun; Gong, Peijun; Liu, Yongning; Sun, Bo; Liu, Xiangzhi; Wang, Pengpeng; Wang, Zongliang; Wang, Weijie; Zhang, Yan

doi:10.1007/s13320-012-0053-8

Cited by 6 publications

(3 citation statements)

References 10 publications

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“…One method to accommodate more FBG sensors on the optical fibre is to narrow down the spectral width of its reflected signal. Furthermore, FBG sensors also experience low SNR values with increasing transmission length [124,125]. Hence, in order to improve SNR, the amplitude of the FBG reflectivity signal need to be increased and the noise caused by crosstalks from adjacent channels need to be minimized [126,127].…”

Section: Optical Fibre-based Multiparameter Sensorsmentioning

confidence: 99%

Optical Fibre-Based Sensors for Oil and Gas Applications

Johny

Amos

Prabhu

2021

Sensors

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Oil and gas (O&G) explorations moving into deeper zones for enhanced oil and gas recovery are causing serious safety concerns across the world. The sensing of critical multiple parameters like high pressure, high temperature (HPHT), chemicals, etc., are required at longer distances in real-time. Traditional electrical sensors operate less effectively under these extreme environmental conditions and are susceptible to electromagnetic interference (EMI). Hence, there is a growing demand for improved sensors with enhanced measurement capabilities and also sensors that generates reliable data for enhanced oil and gas production. In addition to enhanced oil and gas recovery, the sensing technology should also be capable of monitoring the well bore integrity and safety. The sensing requirements of the O&G industry for improved sensing in deeper zones include increased transmission length, improved spatial coverage and integration of multiple sensors with multimodal sensing capability. This imposes problems like signal attenuation, crosstalks and cross sensitivities. Optical fibre-based sensors are expected to provide superior sensing capabilities compared to electrical sensors. This review paper covers a detailed review of different fibre-optic sensing technologies to identify a feasible sensing solution for the O&G industry.

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Section: Optical Fibre-based Multiparameter Sensorsmentioning

confidence: 99%

Optical Fibre-Based Sensors for Oil and Gas Applications

Johny

Amos

Prabhu

2021

Sensors

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“…Signal to noise ratio (SNR) is an important parameter in analyzing the system performance [19]. SNR is defined as the ratio between the reflected intensity and the associated noises.…”

Section: Theoretical Derivation Of Range Gated Reconstruction Modelmentioning

confidence: 99%

Theoretical and experimental investigation into the influence factors for range gated reconstruction

et al. 2016

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Range gated is a laser ranging technique that has been applied in various fields due to its good application prospects. In order to improve the effectiveness of this method, influence factors contributing to the system performance should be well understood. Thus this paper performs theoretical and experimental investigation to comprehend the effects caused by multiple factors on range gated reconstruction. Our study focuses on the distance, target reflection, and acquisition time step parameter where their impacts on the quality of range reconstruction are analyzed. The presented experimental results show the expected trends of range error to support the validity of our theoretical model and discussion which can be used in future improvement works.

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“…The good SNR is the premise of accurate wavelength demodulation. 44 In remote temperature sensing systems, higher SNR permits for longer remote sensing distances, and works against the extensive noisy environments (RL is an example), very high SLSR is indeed needed. New apodization function is the optimum choice in this situation.…”

Section: Apodization Choice For Quasi-distributed Temperature Sensmentioning

confidence: 99%

Performance optimization of apodized FBG-based temperature sensors in single and quasi-distributed DWDM systems with new and different apodization profiles

2013

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In this work, different FBG temperature sensors are designed and evaluated with various apodization profiles. Evaluation is done under a wide range of controlling design parameters like sensor length and refractive index modulation amplitude, targeting a remarkable temperature sensing performance. New judgment techniques are introduced such as apodization window roll-off rate, asymptotic sidelobe (SL) decay level, number of SLs, and average SL level (SLav). Evaluation techniques like reflectivity, Full width at Half Maximum (FWHM), and Sidelobe Suppression Ratio (SLSR) are also used. A “New” apodization function is proposed, which achieves better performance like asymptotic decay of 18.4 dB/nm, high SLSR of 60 dB, high channel isolation of 57.9 dB, and narrow FWHM less than 0.15 nm. For a single accurate temperature sensor measurement in extensive noisy environment, optimum results are obtained by the Nuttall apodization profile and the new apodization function, which have remarkable SLSR. For a quasi-distributed FBG temperature sensor the Barthann and the new apodization profiles obtain optimum results. Barthann achieves a high asymptotic decay of 40 dB/nm, a narrow FWHM (less than 25 GHZ), a very low SLav of −45.3 dB, high isolation of 44.6 dB, and a high SLSR of 35 dB. The new apodization function achieves narrow FWHM of 0.177 nm, very low SL of −60.1, very low SLav of −63.6 dB, and very high SLSR of −57.7 dB. A study is performed on including an unapodized sensor among apodized sensors in a quasi-distributed sensing system. Finally, an isolation examination is performed on all the discussed apodizations and a linear relation between temperature and the Bragg wavelength shift is observed experimentally and matched with the simulated results.

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Analysis and improvement of SNR in FBG sensing system

Cited by 6 publications

References 10 publications

Optical Fibre-Based Sensors for Oil and Gas Applications

Optical Fibre-Based Sensors for Oil and Gas Applications

Theoretical and experimental investigation into the influence factors for range gated reconstruction

Performance optimization of apodized FBG-based temperature sensors in single and quasi-distributed DWDM systems with new and different apodization profiles

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